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How is the n value of the d sublevel of a f-block element related to the period number of the element?

$\begin {array} {1 1}\text{It is always two less than the period number value} \\\text{It is equal to the d value} \\\text{It is greater than the period number by one} \\ \text{It is always one less than the period number value}\end {array}$

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Answer: It is always two less than the period number
The periodic table consists of sublevel blocks arranged in order of increasing energy.
For f-block elements, this sublevel is (n-2), 2 less than the period number
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